Setup dokuwiki base dir only if not given on command-line.

doc/etc-hackerbase

@@ -17,3 +17,6 @@ email-from Brmlab - Rada <rada@brmlab.cz>
 
 # Where to send membership fees summary mailto
 summary-mailto rada@brmlab.cz
+
+# DokuWiki base directory
+dokuwiki /var/www

src/configuration.scm

@@ -114,7 +114,8 @@
 		  (when (not (*summary-mailto*))
 		    (*summary-mailto* v)))
 		 ((dokuwiki)
-		  (*doku-base* v))
+		  (when (not (*doku-base*))
+		    (*doku-base* v)))
 		 )))
 	   (loop (cdr lines))))))
    (when (not (*members-directory*))